yanmar 2gm20 oil warning light and buzzer

[nash1]

When I turn the ignition key to on, the oil warning light and buzzer fails to work. I have checked the wiring and this seems all okay. I removed the oil light bulb and tested it, and it was working. Could it be the oil pressure switch? How would I test this?

Any help would be appreciated.

John Nash

 

[pete]

Hi
On my 1GM10 if you earth the wire that connects to the oil pressure switch the buzzer should buzz and the bulb should light (with the ignition on) if it does its probably a duff sender.
Pete

 

[paulrossall]

On my instalation there is a wiring loom which goes to the ignition switches etc. and it has a connector at the end which clips onto the wires coming from the engine. The wire from the engine is only about a foot long. Check that connector is OK. Otherwise post this question on www.yanmarhelp.com discusion forum. There will be an article on that site on how to check out your problem. Paul

 

[supermalc]

The oil switch is usually an earthing switch on engines. I'm not familiar with this particular one, but remove the wire from the sender. With a meter, or test light check for a circuit from the sender to earth, or negative (if the boat is wired negative earth). The switch should be closed when the engine is not running.

Test the bulb and buzzer by connecting a wire that connects to the sender to earth with the ingition switched on.

 

[Davolas]

Does the engine start button work?

The key switches on Yanmar panels are somewhat unreliable and can fail. So when you turn key contact in switch does not always make. If this is the case no supply to engine start button either so engine will not start. Really usefull when the 1st time it happens is when you want to start engine quickly.

We had this problem last year and as a temporary fix I put a manual switch in parallel.

New switches are about £35. I intend to fit a non Yanmar part when I get round to it.

Spoke to the yanmar dealer and said switch was not fit for purpose (fairly new engine and panel). He said they didn't normally fail and pulled down a large box full. I said if they don't normally fail why do you keep a dozen in stock, no answer?


Regards

Steve

 

[charles_reed]

Sounds as though your sender is jammed open - to confirm use a meter to check continuity when engine is not running.

If it's jammed, you could unscrew it and try cleaning in petrol - but that's a low likelihood of success.

You may have to buy a new one, Yanmar spares are a King's ransome, but they'll almost certainly have sourced from a common supplier to the Japanese motor industry (probably Mazda 323), which might be a less distressing way of replacing it.